Issue with Adding Parts

[ZachCondon]

Description of the bug

I'm having an issue with adding parts to print with my MMU2. I have a set of .3mf files that I import my main file first, then add parts to it so that I can print in multiple colors. I checked PrusaSlicer 2.6.0 alpha6 and PrusaSlicer 2.6.0 beta2 and have the same issue. If I go back to PrusaSlicer 2.5.2, the files work as expected.

Project file & How to reproduce

I've included the saved project files from each version as well as the original .3mf files that I used to make each project. I open the lid.3mf file first, then add the rest of the files to the lid in the slicer.
2.5.2.zip
2.6.0.zip
v2.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

Version 2.5.2+win64 and Version 2.6.0-beta2+win64

Operating system

Windows 11

Printer model

Mk3+ with MMU2

[Jan-Soustruznik]

SPE-1742

[lukasmatena]

Thanks for the report. Fixed in 2.6.0-rc1. Closing.